Tuesday, August 27, 2013

[MW:18531] major difference of B7& B7M

Dear All
What are differences between B7,B7M ?(except as torque value,yield strength)
In our specification usage of B7M confined under insulation.why?
When we can B7 replaced by B7M with regard to service condition?or is it possible with regard to dissimilar strength ?
Regards

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